Q.Why Is This Happening?
My Pachira’s upper branches are dried out. But there are new strouts at bottom side. Could you help me?

Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I am unable to see the damage. This can happen from infection, usually from overly wet soils. New growth can sprout up, but you may find that it starts to wither, as well, as it ages.
Fungicides and proper watering should take care of it!
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/houseplants/pachira-money-tree/growing-money-tree-houseplant.htm